How would I link a debit card in paypal?

I'm trying to buy something via paypal, i linked my bank account, but the person I am buying from needs instant payment. It told me to link a debit card, which I have no idea how to do :/|||if you already have a paypal account, when you log in, you should see under "Notifications" box the hyperlink to "Link and Confirm my debit or credit card." its on the right hand side.